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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($)	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	$ 197,140,000		$ 198,417,000
Investment securities available for sale, Gross Unrealized Gains	92,000		95,000
Investment securities available for sale, Gross Unrealized Losses	(18,433,000)		(19,004,000)
Investment securities available for sale, Allowance for credit losses	(926,000)
Available for Sale, Fair Value	177,873,000		179,508,000
Investment securities held to maturity, Cost Basis	60,740,000		61,878,000
Investment securities held to maturity, Gross Unrealized Gains	9,000		10,000
Investment securities held to maturity, Gross Unrealized Losses	(5,792,000)		(6,696,000)
Investment securities held to maturity, Allowance for credit losses	83,000	$ 114,000
Investment securities held to maturity, Fair value	54,957,000		55,192,000
U.S. Agency
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	12,713,000		11,797,000
Investment securities available for sale, Gross Unrealized Gains	1,000		1,000
Investment securities available for sale, Gross Unrealized Losses	(1,158,000)		(1,265,000)
Available for Sale, Fair Value	11,556,000		10,533,000
Investment securities held to maturity, Cost Basis	2,500,000		2,500,000
Investment securities held to maturity, Gross Unrealized Losses	(418,000)		(432,000)
Investment securities held to maturity, Allowance for credit losses	0
Investment securities held to maturity, Fair value	2,082,000		2,068,000
U.S. Agency mortgage-backed securities
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	100,428,000		102,631,000
Investment securities available for sale, Gross Unrealized Gains	80,000		64,000
Investment securities available for sale, Gross Unrealized Losses	(11,872,000)		(12,710,000)
Available for Sale, Fair Value	88,636,000		89,985,000
Investment securities held to maturity, Cost Basis	18,831,000		18,877,000
Investment securities held to maturity, Gross Unrealized Gains	8,000		8,000
Investment securities held to maturity, Gross Unrealized Losses	(2,036,000)		(2,212,000)
Investment securities held to maturity, Fair value	16,803,000		16,673,000
Municipal
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	20,837,000		20,837,000
Investment securities available for sale, Gross Unrealized Gains	3,000
Investment securities available for sale, Gross Unrealized Losses	(1,503,000)		(1,799,000)
Available for Sale, Fair Value	19,337,000		19,038,000
Investment securities held to maturity, Cost Basis	33,983,000		33,993,000
Investment securities held to maturity, Gross Unrealized Gains	1,000		2,000
Investment securities held to maturity, Gross Unrealized Losses	(3,206,000)		(3,880,000)
Investment securities held to maturity, Allowance for credit losses	3,000	3,000
Investment securities held to maturity, Fair value	30,778,000		30,115,000
Corporate bonds.
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	63,162,000		63,152,000
Investment securities available for sale, Gross Unrealized Gains	8,000		30,000
Investment securities available for sale, Gross Unrealized Losses	(3,900,000)		(3,230,000)
Investment securities available for sale, Allowance for credit losses	(926,000)
Available for Sale, Fair Value	58,344,000		59,952,000
Investment securities held to maturity, Allowance for credit losses		$ 111,000
Corporate bonds and other securities
Information concerning investments with unrealized gains and losses
Investment securities held to maturity, Cost Basis	5,426,000		6,508,000
Investment securities held to maturity, Gross Unrealized Losses	(132,000)		(172,000)
Investment securities held to maturity, Allowance for credit losses	80,000
Investment securities held to maturity, Fair value	$ 5,294,000		$ 6,336,000

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